Lathe-dog.



J. MQcARTH-Y. f

LATHEl DOG. APPLIoATIoN P ILED nu 2.' 1901.

2 SHEETS-SHEET 1.

' ATTORNEYS rnc Nanni: PErERs cm. wasumcron, n. z.

PATENTED JUNE 2, 1908.

110.889,711., PATENTED JUNI: 2, 1908.

J. MUCARTHY.. Y

LATHE DG.

APPLICATION num nu a, 1901.

2 SHEETS-SHEET 2'.

IIIU

"ywfo',

A TTOHNE YS is a view representing a bolt in si UNITED sTATEs rATEN'roEErcE.

JAMES MCGARTHY, OF PLAINFIELl), NEW JERSEY LATHE-DOG.

Specification of Letters Patent.

Application led. May 2, 1907. Serial No. 371,433.

Patented June 2, 1908.

lathe dog which will be capable of the ordi.

nary uses of this tool, but which will have such' a construction as willenable it to be used as a tool holder in performing certain latheoperations.

A further object of the invention is to provide an arrangement when usedin the manner suggested, that will operate to feed the toolautomatically to the work.

The invention consists in the construction and combination of parts tobe hereinafter more fully described and .particularly set forth in theclaims.

Reference is to be hadto the accompanying drawings forming .a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a side elevation showing a portion of a lathe andillustrating the manner in which the dog is em loyed when used as a toolholder; parts o' this view are broken away and shown in section, Fig. 2is a plan of the tail stock, a ortion of which is broken away, the toolholder being represented in section; the tool rest is shown in lan; Fig.3

ge elevation and in cross section; a portion of this view is brokenaway, and in dotted lines a portion of the lathe dog is indicated toillustrate the manner in which the bolt may be attached thereto; Fig. 4is a longitudinal section through the dog constructed according to myinvention; and Fig. 5 lis an end elevation or base view of the dog.

Referring more articularly to the parts, and especially to 4igs. 4 and5, 1 represents the dog. kThe body 2 of this dog presents the usual eye3 in which a piece of Work may be clam ed by means` of a clamping screw4 whic screws in through the lower side of the dog as shown. Oppositethe clamping screw 4 the dog is provided with a tail 5 which projectssubstantially at right angles to the body 2. Through the forward face 6of the dog a tapered bore 7 passes, which lies axially in the tail ofthe dog, as shown. This bore constitutes a socket for the shank of thetool. At the inner end of this bore or socket a recess 8 is formed,opposite which a transverse slot 9 is formed in the tail of the dog, asindicated, and beyond this opening a bore 10 of reduced diameter isformed, which extends to the end of the tail, where a small conicalcounterbore 11 is formed. Just within this counterbore 11 the bore 10 isprovided with a screw thread 12 for a purpose which will appear morefully hereinafter.

At the recess 8 I provide oppositely disposed clamping screws 13 mountedin the tail of the dog, and these are adapted to secure a tool in thesocket, as will be described more fully hereinafter.

On the rear face of the body of the dog, as indicated in Fig. 5, thereis formed an undercut or tee-slot 14, the longitudinal axis of whichextends at right angles to the axis of the bolt 4. This tec-slot 14 isproduced by forming the face of the dog with an upwardly projecting bossor guide 15, and this guide preferably projects slightly at the side ofthe dog, as shown in Fig. 5.

A dog constructed as described can evidently be used as an ordinarylathe dog for driving work held upon the live center or faceplate. Inaddition to this, it has further -uses in holding a tool such as a drillor reamer, and its utility in this connection will now be described,referringl especially to Figs. 1 to 3. In Fig. 1 I illustrate a lathehaving a bed 16, the spindle of the lathe being provided with a chuck 17in which a piece of work 18 is clamped in the usual manner. On thebed 16opposite the spindle, a tail stock 19 is slidably'mounted, and betweenthe chuck and the tail stock a carriage 20 isprovided, with an automaticfeed 21 controlled by means of a handle 22 of any suitable construction.Upon the carriage 20 a cross feed or tool rest 23 is provided, said restconsisting of a block having the usual tool post 24, the said rest beingadvanced by means of a suitable handle 25 operating the cross feed.

kSuppose that it is proposed to drill the piece of work 18; in order todo this, the shank 26 of the drill is inserted in the tapered bore 7 sothat the tang 27 of the shank passes up into the transverse groove orslot 9. The dog is then applied lto the tail stock so that the point ofthe dead center 28 isseated in the counterbore 11.

I provide means for securely holding the dog to the tool rest 23, and tothe tail stock. For this purpose, I provide a bolt 29 which is providedwith a teehead 30 cuton an inclination, as indicated in Fig. 3. The headof this bolt is inserted in the tee-slot 14 and is then rotated untilits inclined end faes` come against the side of the slot, as will bereadily understood, and as shown in Fig. 3. Before inserting the bolthead in the slot as suggested, the bolt is secured in the forward faceof the tail stock, for which purpose its end is threaded as indicated.The body of the bolt passes through the tool post 211, so that it may beclamped to the rest as shown.

In addition to the bolt 29 I provide a bolt 31 which has a tee-headsimilar to the teehead 30 of the bolt 29. This bolt like the bolt 29, isdisposed in a horizontal position and passes through a horizontalopening 32 in the tool rest; it is threaded so as to receive a nut 33which affords means for clamping the tool rest against the rear face ofthe dog. This bolt is threaded continuously to its eX- tremity andscrews into an anchor plate 34 which is attached on the forward face ofthe tail stock by means of a clamping bolt 35 passing through a slot 36.By this construction the position of the bolt may be adjusted asdesired. In practice, the dog is most conveniently applied to the boltheads by sliding it in a horizontal direction over the heads whereuponthe bolts will be rotated to lock their heads in the slot; then the deadcenter 28 may be advanced so as to engage the tail of the dog, asillustrated. With this construction it shouldpnow be understood that thedog will be rigidly secured to the tool rest, while the rear end of thetail of the dog is held in position by the tail stock. It will beunderstood that the fact that the face of the dog is clamped against thetool rest, insures that a proper alinement of the drill will result. Inthis connection attention is drawn to the fact that the bolt 31 operatesespecially for the purpose of clamping the dog to the tool rest, whilethe bolt 29 insures that the dead center 28 will be maintained incontact with the tail of the dog. With the parts in this relation asdescribed, the automatic feed of the lathe will be set by means of thehandle 22, and when the lathe is driven, the carriage will be advancedautomatically, as will be readily understood. Of course, with thecarriage the tail stock advances, together with the dog; these parts alladvancing as though composed of a single piece; in this way the tool isfed to the work.

While I have illustrated the tail stock as holding a drill, it could aswell be used for times have, to feed themselves into the work so fast asto become stuck. In this connection the clamping screws 13 areespecially useful, as they rigidly attach the tool to the dog. Theseclamping screws are also useful in holding a tool in the socket 7, whichis too small to fit the socket.

The presence of the slot 9 facilitates the removal of the tool bydriving a drift through the tail of the dog behind the tang. In additionto this, the tool may be started from its socket by screwing a smallplug into the bore 10. rl`he plug will have a thread engaging with thethread 12, and the extremity of the plug will come against the tang soas tol force the tool outwardly, as will be readily understood.

I-Iaving thus described my invention, I claim as new and desire tosecure by Letters Patent:

' 1. A lathe dog having a socket in the tail thereof adapted to hold theshank of a tool, and having a seat for the tail center opposite saidsocket.

. 2. A lathe dog having a socket in the tail 4thereof adapted to receivethe shank of a tool,

and having an opening in said tail opposite said socket, adapted to beapplied to the dead center of the lathe, the body of said dog havingmeans for attaching a removable fastening thereto. l

3. A lathe dog having a tail with a socket formed in one end thereof,and an opening in the opposite end of said tail adapted to be applied-to the dead center of the lathe, said dog having a body with meansformed thereon for removably engaging a bolt head, and a removable bolthaving a head adapted to attach to said dog.

4. A lathe dog having a body anda tail, said tail having a socket in oneend thereof adapted to receive the shank of a tool, and having anopening in the other end of said tail adapted to be applied to the deadcenter of the lathe, said body having a tee-slot formed therein, and aremovable bolt having its head in said tee-slot-and adapted to connectwith the tail stock.A

5. A lathe dog having a tail with a socket formed in one end thereof,and having an opening opposite said socket ada ted to be applied to thetail center of the athe, said dog having a substantially flat faceadapted to seat against the face of the tool rest, and means forclamping the same upon the face of the tool rest.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

'J AMES MCCARTHY.

